42 consultation in the field of natural gas use, energy efficiency and options in connection therewith; design of retrofitted and new facilities utilizing natural gas; conducting feasibility concerning use of natural gas, energy efficiency and options and connections therewith; energy consulting servcies; providing information services regarding the most efficient and cost-effective use of energy resources concerning natural gas applications; managing energy consumption for industrial and commercial consumers; and association services, namely, promoting the interests of commercial and industrial natural gas equipment manufacturers, suppliers and service providers